US8979532B2 - Dental attachment quality testing device - Google Patents

Dental attachment quality testing device Download PDF

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Publication number
US8979532B2
US8979532B2 US12/980,717 US98071710A US8979532B2 US 8979532 B2 US8979532 B2 US 8979532B2 US 98071710 A US98071710 A US 98071710A US 8979532 B2 US8979532 B2 US 8979532B2
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United States
Prior art keywords
dental crown
attached
crown
resonance frequency
dental
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Expired - Fee Related, expires
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US12/980,717
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English (en)
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US20110200965A1 (en
Inventor
Anders Petersson
Callum Youngson
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Osstell AB
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Osstell AB
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Application filed by Osstell AB filed Critical Osstell AB
Assigned to OSSTELL AB reassignment OSSTELL AB ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: YOUNGSON, CALLUM, PETERSSON, ANDERS
Publication of US20110200965A1 publication Critical patent/US20110200965A1/en
Priority to KR1020137019408A priority Critical patent/KR20130132949A/ko
Priority to JP2013547403A priority patent/JP2014507194A/ja
Priority to EP11853060.9A priority patent/EP2658468A4/de
Priority to PCT/SE2011/051604 priority patent/WO2012091671A1/en
Priority to CN2011800634285A priority patent/CN103327927A/zh
Publication of US8979532B2 publication Critical patent/US8979532B2/en
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/103—Measuring devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C19/00—Dental auxiliary appliances
    • A61C19/04—Measuring instruments specially adapted for dentistry
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/05—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C8/00—Means to be fixed to the jaw-bone for consolidating natural teeth or for fixing dental prostheses thereon; Dental implants; Implanting tools

Definitions

  • the present invention relates to a method and apparatus for testing attachment quality a crown especially a crown of a dental bridge attached to a tooth or an implant of a human or an animal subject.
  • Dental bridges are tooth restorations that can be used to replace missing teeth. They are an excellent alternative to dentures and dental implants; they provide more stability than dentures and the procedure is less invasive then the placement of dental implants. Dental bridges are one method used by dentists to till a gap created by a missing tooth (or teeth). Depending on the dental bridge type, the attachment procedure and cost varies.
  • a dental bridge 10 is made up of two dental crowns 11 for the teeth on either side of the gap 12 and a false or replacement tooth 13 in between.
  • Natural teeth 14 and 15 dental implants or a combination of natural teeth and dental implants can be used to support the bridge 10 .
  • the dentist may sculpt down the teeth on either side of the gap left by the missing tooth.
  • a mold, or impression is taken and sent to a dental laboratory where specialists can custom make your bridge and the crown restorations. Finally, temporary crowns and a bridge will be placed to protect the patients' teeth and gums from further damage.
  • the dental bridge treatment is an effective solution for patients with some missing teeth, there are some risks and limitations associated with the treatment.
  • a method of testing attachment quality of a dental crown attached to a tooth, an implant, or both comprises: detecting at least one resonance frequency of a member when it is in contact with said crown or a part attached to the crown; and interpreting the detected resonance frequency based on degree of attachment of the crown to a tooth, an implant, or both.
  • the method may include the step of releasably attaching the member to the crown or a part attached to it.
  • the member may comprise a cantilever beam.
  • the beam is attached to said crown or part attached to the crown trough a threaded bore.
  • the beam may also be attached to said crown or part attached to the crown by means of an adhesive agent.
  • the beam may be incorporated in said crown or the part attached to it.
  • the method may include the step of comparing the detected resonance frequency with one or more values for the resonance frequencies of the same or similar member from an earlier measurement.
  • the method may include the steps of exciting the member with an AC signal, detecting the response of the member to the AC signal, and varying the frequency of the AC signal until the detected response of the member is at a maximum.
  • the method may include deriving an output which is the ratio of the voltage of the response signal to that of the excitation signal.
  • the method could also include performing a pulse-excitation of the member and detecting the response and performing a frequency analysis of the response signal.
  • the measurement is contactless.
  • the invention also relates to a dental crown attachment quality testing apparatus.
  • the apparatus comprises a detector for detecting at least one resonance frequency of a member when it is attached to the dental crown.
  • the detector for detecting at least one resonance frequency of the member may comprise means for exciting the member with an AC signal, and a transducer for detecting the response of the member to the AC signal, the arrangement being such that the frequency of the AC signal is varied, and the transducer detects when the response of the member is at a maximum.
  • the excitation means and/or detector may comprise a piezoelectric element, the piezoelectric element comprising the excitation means being driven by a variable frequency oscillator.
  • the member comprises a detectable part and that said detector part comprises a detector for contactless detection of said detectable part.
  • the member may comprise a magnetic portion and the detector may comprise a coil.
  • the member may comprise a marker and the detector comprises an illumination detector.
  • the member may consist of a ferromagnetic material and the detector may comprise a coil for detecting disturbances in an external magnetic field.
  • the apparatus may further comprise an amplifier, a processor, and a data store.
  • the signal processing unit is further configured to vary a frequency output of an oscillator, and stores the results in said data store.
  • At least one coil may be configured to output magnetic pulses to a member attached to said member and detect responses corresponding to said magnetic pulses from said member.
  • FIG. 1 is a schematic view of a dental bridge
  • FIG. 2 is a schematic diagram of a second embodiment of apparatus according to the invention.
  • FIG. 3 is a schematic diagram of a second embodiment of apparatus according to the invention.
  • FIG. 4 is a schematic diagram of third embodiment of apparatus according to the invention.
  • FIG. 5 is a schematic diagram of a dental bridge according to one embodiment of according to the invention.
  • FIG. 6 is a diagram from a coarse sweep used to obtain resonance frequencies
  • FIG. 7 is a schematic diagram illustrating the resonance frequency varying with time for a particular bridge.
  • FIG. 8 is a diagram illustrating the data from a sweep used to obtain the resonance frequency the apparatus of FIG. 3 .
  • the apparatus comprises a member in the form of a cantilever beam 20 attached by means of, e.g. a threaded section to an fixture in a suitable position on the bridge 10 (in this case the false tooth) or adhesive.
  • the bridge may be any one of a number of known types.
  • Two transducers, such as piezoelectric elements or strain gauges 21 and 22 are attached, for example bonded, to opposite sides of the beam 20 , gauge 21 being an exciter gauge and gauge 22 a receiver gauge.
  • the exciter gauge 21 may be driven by a variable frequency oscillator, signals from which, for example in the form of a sinusoidal excitation voltage, are fed to the gauge 21 via an amplifier.
  • the oscillator and amplifier may be incorporated in a frequency response analyzer 28 .
  • Signals detected by the receiver gauge 22 are amplified by a charge amplifier 27 and applied as an input to the analyzer 28 .
  • the output from the analyzer which represents the ratio of the response voltage to the excitation voltage, is fed to a processor such as a microprocessor 26 , which is used to vary the frequency output of the oscillator of the analyzer 28 , and store the results in a data store 29 .
  • the results may be printed out, and/or displayed on an oscilloscope 25 , and/or an AC voltmeter or the like.
  • the beam 20 is secured, i.e. screwed, to the bridge 10 .
  • Constant amplitude for example 1 volt
  • AC excitation signals are then applied to the beam 20 via the gauge 21 .
  • the frequency of the AC excitation signals is varied until the amplitude of the signal displayed on the oscilloscope 25 is at a maximum.
  • the resonance frequency is the frequency at which the amplitude of the ratio of the response voltage to the excitation voltage is a maximum.
  • FIG. 6 shows the data from a coarse sweep which is used to obtain the resonance frequency roughly. A finer sweep around this region is then used to identify this frequency, typically the first or fundamental frequency, more accurately. This frequency is noted, and compared, for example, with the data for other bridges/crowns at similar stages of bonding.
  • the resonance frequency will vary with time as depicted in FIG. 7 .
  • an indication of the degree of attachment of the crown to the tooth can be obtained.
  • the technique which is based on detection and comparison of resonance frequency shifts, rather than amplitude changes, is effective to determine the quality of the attachment between the crown(s) and the tooth (teeth) as a function of its stiffness.
  • the beam 20 as shown in FIG. 2 may preferably be of metal such as aluminum, stainless steel or titanium, is dimensioned so as to provide a resonant frequency range of the system of the order of 1 to 20 kHz, more specifically 5 to 15 kHz, and preferably in the region of about 10 kHz.
  • an additional pair of excitation/detection transducers or gauges may be mounted on the sides of the beam at 90° to the transducers or gauges 21 and 22 shown, so as to provide readings at right angles to the latter transducers, without the necessity of re-orienting the beam on the bridge.
  • the beam and/or transducer system could be adapted to turn relative to the dental bridge or crown.
  • the transducers or gauges, and optionally also the beam may be coated, for example with an air dry acrylic material, to protect the transducers during sterilization of the apparatus.
  • the electrical connections or wires connected to the transducers are arranged or adapted to minimize their damping effect on the resonant structure.
  • the member may take a form other than a cantilever beam, and/or the piezoelectric transducers could be replaced by other receiver/transmitter elements, for example employing sonic resonance.
  • the beam instead of being basically straight, could be generally U-shaped, and connected to the bridge or crown by its base.
  • the transducers or equivalent could be mounted on the same or opposite limbs.
  • the measurement is carried out contactless.
  • the system includes a member 30 in the form of a cantilever beam attached to the bridge 10 .
  • the member 30 is provided with a magnetic member 31 .
  • the magnetic member 31 can be provided at one end of the beam 30 , e.g. the free end or integrated inside the beam.
  • the second part of the system comprises the testing apparatus 35 , including a probe 351 and a response analyzer unit 352 .
  • the probe 351 comprises a coil 353 for detecting oscillations of the magnetic member 31 .
  • one of the crowns 11 is attached to an implant 17 instead of a tooth.
  • the implant is anchored to a bone by means of a screw portion 18 .
  • Signals detected by the probe 350 are amplified by an amplifier 354 and applied as an input to the analyser.
  • the output from the analyser which represents the ratio of the response voltage to the excitation, is fed to a processor such as a microprocessor 355 , which is used to vary the frequency output of the oscillator of the analyser, and store the results in a data store 356 .
  • the results can be printed out and/or displayed on a display or the like.
  • the first part of the arrangement according to the invention comprises, a member in the form of a cantilever beam 31 as in the earlier embodiment attached to the dental bridge 10 .
  • the beam 31 in this case is provided with markings 42 , such as lines, arranged at one end of the beam 21 .
  • the second part of the arrangement comprises the testing apparatus 450 , including a probe 451 and a response analyzer unit 452 .
  • the probe 450 comprises a light source 453 a , preferably but not exclusively a laser, and a light detector 453 b for detecting reflections from the beam and thus oscillations of the beam.
  • the light source is preferably Laser diode.
  • the beam is provided with one or several markers, such as darker (or lighter) sections, which effect the reflection of the light.
  • the beam is excited manually or e.g. means of an electrical exciter, by applying e force on the beam.
  • the light source on the tip of the probe illuminates the beam and the light detector 453 b detects the reflected light.
  • the detected light signal is converted to an electrical signal by the detector, and signals detected by the probe 451 are amplified by an amplifier 454 and applied as an input to the analyser.
  • the output from the analyser which represents the ratio of the response voltage to the excitation, is fed to a processor such as a microprocessor 455 , which is used to vary the frequency output of the oscillator of the analyser, and store the results in a data store 456 .
  • the results can be printed out, and/or displayed on a display or the like.
  • the beam 31 is secured to the dental bridge 10 .
  • the beam according to the invention is disposable, which means that it can be detached and disposed, providing a hygienic testing arrangement.
  • FIG. 8 shows the data from a coarse sweep, which is used to obtain the resonance frequency roughly in the apparatus of FIG. 3 .
  • a finer sweep around this region is then used to identify this frequency, typically the first or fundamental frequency, more accurately.
  • This frequency is noted, and compared, for example, with the data for an earlier measurement (e.g., when the bridge was mounted).
  • the resonance frequency will vary with the degree of attachment of the crowns to the teeth.
  • an indication of the degree of attachment of the bridge can be obtained.
  • the technique which is based on detection and comparison of resonance frequency shifts, rather than amplitude changes, is effective to determine the quality of the attachment.
  • the beam may preferably be of a metallic material, for example titanium or aluminium, is dimensioned so as to provide a resonant frequency range of the system (placed bridge and beam) of the order of 1 to 20 kHz, more specifically 1 to 10 kHz, and preferably in the region of about 8 KHz.
  • the upright beam can be approximately 1 cm high.
  • the beam may be made of a ferromagnetic material and can be brought into excitation by means of an external magnetic field generated by a field generator.
  • the field generator can be a permanent magnet for generating a DC field or a coil for generating an AC filed.
  • the probe may also be externally arranged.
  • the magnet attached to a smart peg may be excited with magnetic pulses. After each pulse, the alternating magnetic field that is the result of the self-vibrating peg is picked up by the electric coil in the measurement probe.
  • the magnetic pulses may be generated by another coil in the same probe (or an additional probe).
  • the metal pegs have a simplified mechanical design compared to the transducers, and do not require individual calibration. It is not possible to store any calibration parameters in them since they are not electrically connected to the instrument. Instead, the individual differences between pegs are reduced to a minimum by a carefully controlled manufacturing process.
  • the pegs also have a simpler mechanical behavior when they are vibrating at their resonance frequency. They are more sensitive and have a predictable behavior down to very low attachment stability.
  • a measurement may consist of a number of pulses, e.g. 4 or 30 pulses.
  • these pulses cover the frequency spectrum from 1 to 10 kHz. Since the pulses are more narrow-band, the 30 pulses contain more energy. This makes the responding signal stronger, and the signal to noise ratio is improved, making the measuring device of the invention less sensitive to surrounding electromagnetic noise. It is recognized by a skilled person that the number of pulses are not limited to 4 or 30.
  • FIG. 5 An embodiment of a dental bridge 10 is illustrated in FIG. 5 .
  • detectable portions such as magnetic or optical portions 16 are incorporated in the crowns 11 or the false tooth 13 . This embodiment allows using same measuring points.
  • the transducers or gauges, and optionally also the beam may be coated, for example with an air-dry acrylic material, to protect the transducers during sterilization of the apparatus.
  • the member may take a form other than a cantilever beam.
  • the beam instead of being basically straight, could be generally U-shaped, and connected to the bridge by its base.
  • alternative detectors such UV, sound, and the like can also be used.
  • the invention is not limited to bridges and can be applied to crowns or other arrangements to be attached to a tooth.
  • Comprise, include, and/or plural forms of each are open ended and include the listed parts and can include additional parts that are not listed. And/or is open ended and includes one or more of the listed parts and combinations of the listed parts.

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Biophysics (AREA)
  • Veterinary Medicine (AREA)
  • Public Health (AREA)
  • Animal Behavior & Ethology (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Dentistry (AREA)
  • Epidemiology (AREA)
  • Surgery (AREA)
  • Physics & Mathematics (AREA)
  • Pathology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Medical Informatics (AREA)
  • Molecular Biology (AREA)
  • Radiology & Medical Imaging (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Prostheses (AREA)
  • Dental Prosthetics (AREA)
  • Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
US12/980,717 2003-06-19 2010-12-29 Dental attachment quality testing device Expired - Fee Related US8979532B2 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
CN2011800634285A CN103327927A (zh) 2010-12-29 2011-12-29 牙齿附连质量的测试设备
KR1020137019408A KR20130132949A (ko) 2010-12-29 2011-12-29 치아 부착 품질 시험 장치
PCT/SE2011/051604 WO2012091671A1 (en) 2010-12-29 2011-12-29 Dental attachment quality testing device
JP2013547403A JP2014507194A (ja) 2010-12-29 2011-12-29 歯科用取付け品質検査装置
EP11853060.9A EP2658468A4 (de) 2010-12-29 2011-12-29 Vorrichtung zur prüfung der qualität einer zahnärztlichen befestigung

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE0301825A SE0301825L (sv) 2003-06-19 2003-06-19 Metod och system vid implantattest
SE0301825-6 2003-06-19
PCT/SE2004/000998 WO2004110272A1 (en) 2003-06-19 2004-06-21 Method and arrangement relating to testing objects

Related Parent Applications (1)

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US12/393,931 Continuation-In-Part US8391958B2 (en) 2003-06-19 2009-02-26 Method and arrangement relating to testing objects

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US20110200965A1 US20110200965A1 (en) 2011-08-18
US8979532B2 true US8979532B2 (en) 2015-03-17

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US (1) US8979532B2 (de)
EP (1) EP1641394B1 (de)
JP (1) JP4806348B2 (de)
KR (1) KR101302111B1 (de)
DK (1) DK1641394T3 (de)
ES (1) ES2392534T3 (de)
PL (1) PL1641394T3 (de)
SE (2) SE0301825L (de)
WO (1) WO2004110272A1 (de)

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US20140318247A1 (en) * 2006-08-17 2014-10-30 Covenant Health Apparatus and method for assessing percutaneous implant integrity

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SE0301825L (sv) 2003-06-19 2005-02-18 Integration Diagnostics Ltd Metod och system vid implantattest
DE102006051032A1 (de) * 2006-10-21 2008-04-30 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. System und Verfahren zur Bestimmung des Verankerungszustandes implantierter Endoprothesen
SE1001237A1 (sv) * 2010-12-29 2012-06-30 Ostell Ab Anordning för kvalitetes provning av ett dentalt fäste
TWI546060B (zh) * 2013-12-02 2016-08-21 國立中央大學 骨缺損檢測系統、裝置及方法
KR101643586B1 (ko) * 2015-02-12 2016-07-29 오스템임플란트 주식회사 치열 교정용 스크류 어댑터
WO2016204684A1 (en) * 2015-06-18 2016-12-22 Osstell Ab Implant stability measuring device and method
JP2017144061A (ja) * 2016-02-17 2017-08-24 学校法人慶應義塾 整形外科用インプラントの設置強度評価方法、整形外科用インプラント、および整形外科治具
GB2554456A (en) * 2016-09-29 2018-04-04 Osstell Ab A probe
KR101838179B1 (ko) * 2016-12-19 2018-04-26 주식회사 써지덴트 임플란트용 고정력 측정 장치
JP7288670B2 (ja) * 2017-03-10 2023-06-08 ユニヴァーシティ オブ ワシントン 医療用インプラントの安定性を測定および評価するための方法およびシステム
JP7281770B2 (ja) * 2017-09-14 2023-05-26 慶應義塾 インプラント設置強度評価方法、インプラント設置強度評価装置、およびプログラム
DK3899486T3 (da) * 2018-12-21 2022-09-26 Tmd Friction Services Gmbh Anordning og fremgangsmåde til beregning af mekaniske egenskaber ved et prøveemne
JP2020146072A (ja) * 2019-03-11 2020-09-17 株式会社ナカニシ 歯科用医療装置
TWI729594B (zh) 2019-11-27 2021-06-01 國立中央大學 檢測裝置
US20210325437A1 (en) * 2020-04-19 2021-10-21 Research Electronics International, Llc Cached Peak Graphical Display for Spectrum Analyzers
CN114948314A (zh) * 2022-07-11 2022-08-30 长沙微笑美齿智能科技有限公司 一种用于检测植入牙槽骨种植体稳固度的传感装置及方法
KR102824770B1 (ko) 2022-10-13 2025-06-26 주식회사 덴티스 임플란트 동요도 측정장치

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PL1641394T3 (pl) 2013-01-31
SE0301825L (sv) 2005-02-18
ES2392534T3 (es) 2012-12-11
JP2006527627A (ja) 2006-12-07
DK1641394T3 (da) 2012-10-29
EP1641394B1 (de) 2012-08-08
KR101302111B1 (ko) 2013-09-03
WO2004110272A1 (en) 2004-12-23
US20110200965A1 (en) 2011-08-18
KR20060067926A (ko) 2006-06-20
SE0301825D0 (sv) 2003-06-19
SE1641394T5 (de) 2016-02-02
EP1641394A1 (de) 2006-04-05

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